Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43dfe317217ef0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 18:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd4421f550e383640e33860a173cc8fc SHA-1: 17a5e7b168737c3887055d3468a8444e27ffb3de SHA-256: ad43dfe317217ef02d698b1b1aa12243c83f159807b0cae47fde1abe469461c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ohmytour.kr/FileData/ckfinder/files/20210912_E8ACAD79EDE51B3D.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zojomenoximufemaxu.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/potiv.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/sevofapapuxupita.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/53155110334.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/53184955513.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/88359031350.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusababizel.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/20698032756.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/58901586972.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/pifenujurebopikotum.pdfIn PDF document text
    • https://rafautama.com/uploads/file/fezifat.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eddcc404---34496578154.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109011131414264.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/funamipa.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vunibikonom.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iq3k85iu739mf3cqtvcpkmvmg1/tafefakugobus.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/59089373358.pdfIn PDF document text
    • http://ladna.pl/user_images/file/51976062911.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/33c1cd5aa9ae4caec8f8a5e3f55a1b8d/susulasig.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/desisevuvapejojotuzi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142898d4d72a---14313009563.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/bupivajuwogopajeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+fire+red+version+download+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 10808 bytes
SHA-256: bb5a456c7e468f1eb5876dde20b528e3a007fe898cf6baac99b9cf6676d48491
font_02_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 19956 bytes
SHA-256: cfe01ae1d70b50e72ff4dd5a1bd8b6a864ac580bb8dbe5b3863ff93756b61bca

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